180999909 has 12 divisors (see below), whose sum is σ = 275204800. Its totient is φ = 114315624.

The previous prime is 180999899. The next prime is 180999911. The reversal of 180999909 is 909999081.

It is not a de Polignac number, because 180999909 - 2⁸ = 180999653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (180999919) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 529069 + ... + 529410.

Almost surely, 2^180999909 is an apocalyptic number.

180999909 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

180999909 is a deficient number, since it is larger than the sum of its proper divisors (94204891).

180999909 is a wasteful number, since it uses less digits than its factorization.

180999909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1058504 (or 1058501 counting only the distinct ones).

The product of its (nonzero) digits is 472392, while the sum is 54.

The square root of 180999909 is about 13453.6206650849. The cubic root of 180999909 is about 565.6651877839.

The spelling of 180999909 in words is "one hundred eighty million, nine hundred ninety-nine thousand, nine hundred nine".